/*
 * Copyright (c) 2025 Oracle and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.helidon.service.jndi;

import java.util.Hashtable;
import java.util.concurrent.atomic.AtomicBoolean;

import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.spi.InitialContextFactory;

/**
 * Implementation of the initial context factory for JNDI.
 */
public class NamingFactory implements InitialContextFactory {
    private static final AtomicBoolean REGISTERED = new AtomicBoolean(false);

    /**
     * Public constructor is required by contract of {@link javax.naming.spi.InitialContextFactory}.
     */
    public NamingFactory() {
    }

    /**
     * Register the initial context factory if not yet registered.
     */
    public static void register() {
        if (REGISTERED.compareAndSet(false, true)) {
            String property = System.getProperty(Context.INITIAL_CONTEXT_FACTORY);
            if (property == null) {
                System.setProperty(Context.INITIAL_CONTEXT_FACTORY, NamingFactory.class.getName());
            }
        }
    }

    @Override
    public Context getInitialContext(Hashtable<?, ?> environment) throws NamingException {
        return new RootContext(environment);
    }
}
